Machine fob facing and polishing millstones



UNITED STATES PATENT OFFICEG EDMUND MUNSON, OF UTICA, NEW YORK.

MACHINE FOR FACING AND POLISHING MILLSTONES.

Specification of Letters Patent No. 31,255, dated January 29, 1861.

To all whom it may concern:

Be it known that I, EDMUND MUNsoN, of Utica, in the county of Oneida and State of New York, have invented a new and Improved Machine for Facing and Polishing Millstones; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in whichd Figure lis a side sectional view of my invention taken in the line 5c, m, Fig. 3; Fig. 2, an end view of the same; Fig. 3, a plan or top view of the same; Fig. et, a detached face view of a chuck or holding plate pertaining tothe same; Fig. 5, a section of the latter taken in the line y, y, Fig. t.

Similar letters of reference indicate corresponding' parts in the several figures.

This invention consists in a novel arrangement of cutters, polishing device and gearing, substantially as hereinafter fully described, whereby mill stones may be faced and polished very expeditiously and in a perfect manner, and the individual blocks of a stone also roughed off-and faced, before being connected together, by simply using a chuck or holding` plate.

The invention obviates the necessity entirely of manual labor so far as the facing and polishing is concerned, the cementing and binding of the blocks together to form the stone of course being done by hand, but the latter is comparatively light labor, while the manual cutting of the French bur blocks is very laborious the material being so very hard.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a bed plate on which uprights a., are secured, said uprights supporting a horizontal frame B, which is parallel with the bed plate A.

C, is the driving shaft of the machine which has its bearings in pendants projecting from the frame B. @n the inner end of shaft G, there is placed a bevel toothed wheel D, which gears into a bevel pinion E, on a vertical shaft F, the lower end of shaft F, being stepped in a bridge tree AX, adjusted by a screw and nut (LX, bx, the bed plate A, and its upper end passing through the back part of the frame B, and having a pulley b, on its upper end. On the lower part of the shaft F, there 1s a screw c, which gears into a worm wheel (Z, at the back end of a horizontal shaft G, the bearings of which are on the bed plate A. On the front end of the shaft G, there is placed a screw e, which gears into a worm wheel f, on the lower part of a vertical shaft- H. On the shaft H, there is placed a pinion g, which is allowed to slide freely up and down on its shaft but always turns with it on accountof a feather and groove connection. This pinion g, is connected to a lever I, by actuating which the pinion g, may be adjusted in or out of gear with a toothed wheel J, on a. vertical shaft K, the lower end of which is stepped in the bed plate A, its upper bearing h., being attached to a traverse bar j, as also is the upper' bearing j, of the shaft H, see Fig. 9..

O11 the'upper end of the shaft K, there is placed a socket formed of arms la, to receive the mill stone L, to be operated upon, the back of the stone being on the arm 7c and its face consequently uppermost. The mill stone L, may be secured on the arms 7;', by any proper means. On the shaft K, just below the wheel J, there is a pulley Z, around which a belt M, passes, said belt also passing around a pulley m, on shaft F.

N, is a friction pulley which is placed on a vertical pin n, attached to a lever' O, which has its fulcrum at 0. The outer part of the lever O is a toothed segment O, into which a sliding rack P, gears as shown clearly in Fig. 3.

On the horizontal frame B, there is placed a sliding-fran'ie Q, which may be adjusted back and forth on frame B, by means of racks 79 y) and pinion Q, g, the racks being attached to the under side of the frame Q, and the pinions g, being on a shaft It, which is placed transversely at theA under side of the frame B, and has a crank at one end.

At one side of the frame Q, there is a rack r, into which a pinion s, on a vertical shaft S, gears, the upper end of said shaft having a cross head T, on itwith a vertical roller at each end.

At the front end of the sliding frame Q, there are two uprights u, u, one at each side, and the upper ends of these uprights are connected by a traverse bar o, to the center of which and at its back side there is attached a1 horizontal bar w, the bar w, projecting at right angles from the back e, and having its back end attached to an upright a, at the back part of the frame Q.

tached a vertical rod a'.

Between the uprights u, u, there is placed an upright sliding frame U, and to the back side of this frame there is attached at right angles a frame V, the back end of which works on the upright a, which is a guide for it. The frames U, V, may be raised and lowered by means of vertical screws Z1', which are turned by means of bevel gears c, and shafts d, e, all the screws beingturned simultaneously by turning shaft cl, as will be seen by referring to Fig. 3.

In the lower part of the frame U, there are placed two horizontal cutter heads f,

These cutter heads are simply rectangular bars placed in a horizontal position with vertical cutters g, fitted in them and secured by set screws L, there being two rows of cutters in each cutter -head and several cutters secured side by side in each hole or aperture in the heads f. The cutters g, in one row of a head f', are opposite the spaces between the cutters of the other row. To each end of each cutter head f', there is at These rods extend up through a traverse bar j, of the frame U, and through guides s, attached to said frame and the upper ends of the rods z", are connected by cross barsv WV? In the frame U, and directly over each cutter head f, there is a vertical shaft X. These shafts X, pass through the cross bars WV, and have spiral springs Z', on them said' springs being between the bars W, and top cross bar m', of the frame U, see Figs. l and 2. The springs Z', have a tendency to keep the cutter heads f', down on elastic stopsmf, at the lower part of the frame U.

On the shafts X, X, there are secured horizontal disks Y, Y, one on each shaft and to the upper or face side of each disk Y, there are secured two cam projections 0, 0, which asthe shafts X, X, rotate act against pendent projections p, p, at the under sides of the cross bars IV.

In the frame V, there is placed a vertical shaft Z, which has a working pulley Q', on it, and an idle pulley q, and also a bellshaped socket A, at its lower end. Within the socket A, the polisherB is secured, said polisher being of stone or any suitable material.

C', is a belt which passes around the pulley b, of shaft F, between the rollers t, t, around the pulley g, of shaft Z, and also around the working or the idle pulley fr, r, of the shafts X, X, said belt C', being placed on either by means of a shipper D.

The lower parts ofthe shafts X, X, are fitted in steps s', and rest on rods t', the lower ends of which have screw threads on them and are fitted-in female screw 'threads or nuts u', at the upper part vof worm wheels fv, into which screws w, on a sha ft E', gears see Figs. l, and 2.

The operation lis as follows. The mill stone L, is adjusted on the arms 7c, and the cutters g, are adjusted as required near the surface or face of the stone by raising` or lowering the frame U, which. is done by turning the shafts el e. The frame Q., is moved forward by turning the shaft R, so that the cutters g', will be over the center of the mill stone and the belt C, is cast on the working pulleys 1", of the shafts X, X. The pinion g, of shaft I-I, is also moved up and thrown in gear with the wheel J. The shaft C, is then rotated by any convenient power and the mill stoneL, is slowly rotated through the medium of the screw c, on shaft F, the wheel CZ, and screw e, on shaft Gr, the wheel f, pinion g, on shaft H, and the wheel J, on shaft K, and at the same time a reciprocating motion is given the cutters g, in consequence of the belt C, rotating the shafts X, X, and the cam projections 0', of the disks Y, raising the cross bars `W, and consequently the cutter heads f, and cutters g', the springs Z, forcing the cutters down as the projections 0, pass the projections 29, of the bars IV. The length of the stroke of the cutters may be regulated by adjusting the shafts X, X, raising or lowering them through the medium of the screws w, on shaft E', the worm wheels o, and screw rods s, on which the shaft X, rests; and the cutters may be regulated in a vertical position relatively with the mill stone by adjusting frame U, as previously stated. The action of the cutters g', face the stone and unnecessary concussione are avoided as the cutter heads f', strike the elastic stops u', at the termination of their descent. When the mill stone is faced the belt C', is "cast on the idle pulleys r, of the shafts X, and on the working pulley g', of shaft Z, and the latter with polisher B', is rapidly rotated. The pinion g, on shaft H, is thrown out of gear with the wheel J, and the pulley N, by actuating the rock bar I), is adjusted against the belt M, and the latter tightened so that the shaft- K, will be rotated directly from shaft F, and the mill stone L, thereby rap idly rotated while the polisher B', acts upon it. When the mill stone is polished the frame Q, is moved back by turning the shaft R, so as to leave the mill stone perfectly free from all obstructions, the cutters, frame, etc., and admit of its ready removal from the arms 7c, and the adjustment thereon of another mill stone for a succeeding operation.

I would remark that when the belt C, is on the working pulleys r, of the shafts X, X, it is on the idle pulley g, of the shaft Z, and when on the latter pulley it is off the former ones. I would also remark that the mill stone L, may be adjusted vertically as occasion'may require while being operated upon through the medium of the bridge tree AX.

In lorder to face the individual blocks of a mill-stone before being adjusted together I use a chuck or holding plate BX, see Figs. 4L and 5. This chuck or holding plate is a hollow cylinder open at the top and provided with four radial sockets CX, in Which the blocks CX, are placed and secured by set screws (ZX. This chuck is fitted on the arms 7s, of shaft K, precisely the same Way as the face of the mill stone. This previous facing of the blocks CX greatly facilitates'the subsequent operation of facing the mill stone.

The rollers t, t, being attached to the cross head T, and the latter secured to the shaft S, which is turned by the rack and pinion r, s, as the frame Q, is moved, serve to keep the belt C', always taut or at a proper tension in Whatever position the frame Q, may be' in the scope f its movement.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is l. The employment or use of the cutters y', placed in suitable cutter heads f, having a rising and falling movement in connection with the rotary mill stone shaft K, arranged for joint operation with the critters g, sub'- stantially as and for the purpose set forth.

2. The arrangement of the adjustable with the mill stone as desired and the latter frame Q, moved horizontally so that the frames U, V, may be drawn back from above the surface of the mill stone When desired.

3. In connection with the cutters g, vthe rotary polisher B, placed in the frame V, and arranged substantially as shown so as to be operated by the same belt C, Which rotates the shafts X, X, in the frame U, that assist in operating the cutters g.

l. The arrangement of the sliding pinion g, on shaft H, the belt M, Wheel J, on shaft K, the shaft G, With its screvv c, and Wheel CZ, and the shaft F, with its screw c, and belt C', passing around the pulleys on the shafts X, X, Z, all being arranged substantially as and for the purpose set forth.

5. The chuck or holding plate BX, provided With the radial sockets 0X, and so arranged as to be applied to the rotary shaft K, for the purpose specified.

EDMUND MUNSON. lVitnesses DEXTER GILLMORE, FREDK. B. I-IART. 

